ÌâÄ¿ÄÚÈÝ
ÈçͼËùʾ,Çᵯ»Éƽ·ÅÔÚ´Ö²ÚµÄˮƽµØÃæÉÏ,ͬÖÖ²ÄÁÏ×ö³ÉµÄÁ½¸öÎï¿é·Ö±ðÏòÇᵯ»ÉÔ˶¯²¢Ñ¹Ëõµ¯»É.ÉèÎï¿éÖÊÁ¿Îªm,ÔÚ½Ó´¥µ¯»ÉÇ°µÄËÙ¶ÈΪv0,¶¯Á¿Îªp0,´Ó½Ó´¥µ¯»Éµ½µ¯»É±»Ñ¹Ëõµ½×î¶ÌµÄʱ¼äΪt,µ¯»ÉµÄ×î´óѹËõÁ¿Îªx.Á½¸öÎï¿éÏà±È½Ï( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241424247972462.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241424247972462.png)
A£®Èôp0ÏàµÈ,ÔòxÒ»¶¨Ïàͬ |
B£®Èôv0ÏàµÈ,ÔòtÒ»¶¨Ïàͬ |
C£®Èôp0ÏàµÈ,m½Ï´ó,Ôòx½ÏС |
D£®Èôv0ÏàµÈ,m½Ï´ó,Ôòt½ÏС |
C
ÏòÓÒѹËõµ¯»ÉµÄ¹ý³ÌÖÐ,Îï¿éµÄ¶¯ÄÜת»¯Îªµ¯ÐÔÊÆÄܺÍÄÚÄÜ.ÓÉEk=p2/2m,Èôp0ÏàµÈ,m½Ï´óµÄÎï¿é¶¯ÄÜEk½ÏС,µ¯»ÉµÄ×î´óѹËõÁ¿x½ÏС,A´íÎó?CÕýÈ·;µ¯»ÉѹËõµ½×î¶Ìʱ,Îï¿é¶¯Á¿¼õСµ½Áã,¶ÔÎï¿éÓɶ¯Á¿¶¨ÀíµÃFt=p0=mv0,Èôv0ÏàµÈ,m½Ï´óµÄ»¬¿éËùÊÜĦ²ÁÁ¦½Ï´ó,¿Ë·þĦ²ÁÁ¦×ö¹¦×ª»¯µÄÄÚÄܽ϶à,ת»¯µÄµ¯ÐÔÊÆÄܽÏС,µ¯»ÉѹËõÁ¿½ÏС,Îï¿éÊܵ½µÄµ¯»Éƽ¾ùµ¯Á¦½ÏС,Îï¿éÊܵ½µÄˮƽ·½ÏòºÏÁ¦½ÏС,Ôò×÷ÓÃʱ¼ät½Ï´ó,D´íÎó.
![](http://thumb2018.1010pic.com/images/loading.gif)
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿